InChI=1S/C12H16N2O8/c15-6(2-1-5-3-13-4-14-5)21-12-9(18)7(16)8(17)10(22-12)11(19)20/h3-4,7-10,12,16-18H,1-2H2,(H,13,14)(H,19,20)